knew one stuff (verb) know by heart: have absolute knowledge
Sinonime: conceited, egoistic, egoistical, egomaniacal, egotistic, egotistical, individualist, megalomaniac, narcissistic, pompous, self-absorbed, self-centered, self-concerned, self-indulgent, self-interested, self-loving, self-serving, selfish, stuck-up, vainglorious, wrapped up in oneself